屏蔽网页上的鼠标和快捷键

// 屏蔽鼠标右键菜单
document.oncontextmenu  = function () {event.returnValue=false;}

// 屏蔽掉其他与程序无关的键
document.onkeydown = function () {
                                            //8 退格键
                                            //78 Ctrl+N
                                            //37 Alt+ 方向键 ←
                                            //39 Alt+ 方向键 →
                                            //116 F5 刷新键
                                            //82 Ctrl + R
                                            //121 shift+F10
                                            //115 屏蔽Alt+F4
                                            //屏蔽 shift 加鼠标左键新开一网页
                                            if (window.event.keyCode==8
                                                || event.keyCode==78
                                                || event.keyCode==37
                                                || event.keyCode==39
                                                || event.keyCode==82
//                                                || event.keyCode==112     // F1
                                                || event.keyCode==113     // F2
                                                || event.keyCode==114     // F3
                                                || event.keyCode==115     // F4
                                                || event.keyCode==116     // F5
                                                || event.keyCode==117     // F6
                                                || event.keyCode==118     // F7
                                                || event.keyCode==119     // F8
                                                || event.keyCode==120     // F9
                                                || event.keyCode==121     // F10
                                                || event.keyCode==122     // F11
                                                || event.keyCode==123     // F12
                                                || (window.event.srcElement.tagName == "A" && window.event.shiftKey))
                                            {
                                                event.keyCode     = 0;
                                                event.returnValue = false;
                                            }
                                      }